The parents of murdered border agent Brian Terry told Fox News’ Sean Hannity on Thursday that they think Attorney General Eric Holder and other Justice Department officials are “hiding something” in their response to the botched anti-gunrunning operation Fast and Furious.

The operation let illicit guns “walk” in the hope of tracking them to bigger traffickers, but many of the guns just disappeared into Mexico. Two of those guns were later found at the crime scene where Terry was killed in December 2010 just north of the border.

A House panel voted Wednesday along party lines to recommend holding Holder in contempt of Congress for not handing over a trove of documents related to Fast and Furious, and GOP leaders are considering a full House vote. President Obama has asserted executive privilege in keeping many of the documents out of public view.